flat point set screw 平端定位螺钉
cup point set screw 圆端止动螺钉
pivot-point screw 枢轴螺旋
zero point adjustment screw 零点调节螺丝
Flanged 12-Point Screw 凸缘12点螺钉
point of pedicle screw insertion 和椎弓根螺钉进钉点
screw entry point 螺钉进钉点
screw twelve point 十二角螺栓
screw entrance point 螺钉进钉点
SCREW TWELVE POINT CAP 十二角头螺栓
To resolve the problem of the point and direction of the fixation of Axis lateral arch screw, using navigator finds the safe trajectory.
针对枢椎侧方椎弓螺钉固定时确定进针点和进针方向困难的问题，通过导航仪寻找安全钉道。
Conclusion the superior lateral quadrant was the safe area of the cervical lateral mass screw. The safe exit point was the juncture between the transverse process and the facet.
结论颈椎侧块外上象限是螺钉植入的安全区，横突与关节突相交处是安全的出钉点。
Objective: to go to more exact point and direction during the screw fixation make sure to insert screw successfully by measuring the dimension of the lower cervical spine pedicle.
实验目的：本文目的基于进行下颈椎椎弓根的相关经线及角度测量，定位更准确的椎弓根进钉点、置钉方向，为成功应用经颈椎椎弓根螺钉技术提供必要信息。
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